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- W2291042716 abstract "Increased aluminum levels have recently been correlated yrith fish mortality in acidified lakes. The toxic response to Al in freshwater is variable and depends on pH moderated chemical speciation of the Al. At around pH 5.0, maximum fish mortality results from polymeric aluminum hydroxides. At lower pH levels, mortality is still observed and the effect is likely due to monomeric Al. Populations of forage fish sepcies are less sensitive to Al and their abundance ha's increased in acidified lakes. The pumpkinseed sunfish (Lepomis gibbosus Rafinesque), a common forage species in U.S. lakes, is considered fairly insensitive to low pH, however Al toxicity data for this species are presently lacking. Pumpkinseed post-larvae were exposed to Al and low pH water in a flow-thrfough system with nominal Al additions of 50, 100, 500, and 1000 yg/L at a pH range of 4.1-5.5. 9 At pH=4.5, 50% mortality occurred within a nominal range of 5001000 yg Al/L, while at pH=5.0, 50% mortality occurred within the range of 100-500 yg Al/L. At the higher end of the pH range, mucus accumulation on the fish gills suggested mortality resulted from respiratory failure. At the lower end of the pH range, no gill damage was observed and mortality may have resulted from osmoregulatory distress. At intermediate pH levels, mortality of post-larvae was likely caused by a combination of both factors, Compared to other fish, pumpkinseed sunfish appear to be more tolerant of low pH and elevated Al concentrations. As a result, the relative abundance of purapkinseed sunfish may increase in North American lakes that are subjected to increasing acidity." @default.
- W2291042716 created "2016-06-24" @default.
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- W2291042716 date "1984-01-01" @default.
- W2291042716 modified "2023-09-27" @default.
- W2291042716 title "Influence of pH on aluminum toxicity in pumpkinseed sunfish (Lepomis gibbosus rafinesque)." @default.
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